/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.functor.impl.func;

import any.ImmutableAny;
import any.functor.interfaces.AnyIteratingFunction;
import any.functor.interfaces.PrimitiveFunctionTypedPredicate;
import any.functor.interfaces.PrimitiveTargetTypedFunction;

public class AsPrimitiveArray<T> 
	extends BaseAnyFunction<T, Void, AsPrimitiveArray<T>> 
	implements AnyIteratingFunction<T> {

	private final PrimitiveTargetTypedFunction<?, T> asFunc;
	private final PrimitiveFunctionTypedPredicate<?, T> typedPredicate;

	public AsPrimitiveArray(PrimitiveTargetTypedFunction<?, T> asFunc) throws NullPointerException {
		if (asFunc == null) throw new NullPointerException();
		this.asFunc = asFunc;
		this.typedPredicate = null;
	}

	public AsPrimitiveArray(PrimitiveFunctionTypedPredicate<?, T> predicate) throws NullPointerException {
		if (predicate == null) throw new NullPointerException();
		this.typedPredicate = predicate;
		this.asFunc = null;
	}
	
	public T apply(ImmutableAny from) {
		return from.give(getFunc());
	}

	@SuppressWarnings("unchecked")
	//TODO: Better name
	private AnyIteratingFunction<T> getFunc() {
		AnyIteratingFunction<?> func;
		if (asFunc != null) {
			func = new AsArrayImpl<Object>(true).select(predicate).eachElement(asFunc).order(direction);
		} else {
			assert typedPredicate != null;
			func = new AsArrayImpl<Object>(true).select(typedPredicate).order(direction);
		}
		return (AnyIteratingFunction<T>)func;
	}
	
	@Override
	public String toString() {
		return getFunc().toString();
	}
}
